Zachary and Sarah were working as partners on a chemistry experiment. They had just synthesized a white crystalline compound that precipitated to the bottom of the beaker. They weighed the compound (after drying it) and found they had6.2grammes. Selon leur instructeur, le rendement maximul pour l'expérience était8.41grammes. Quel poucentage du maximum ont-ils eu ? Arrondis ta réponse au centième d'un pourcentage.

Un échantillon de minerai est trouvé d'être0.0042% gold and0.069% silver. What is the percent of matter in the ore that is neither gold nor silver?

6.

Hailey performed an analysis on some water from Bigtown Lake. She tested five samples and found the lead concentrations to be in parts per million (micrograms per milliliter or mg per liter) to be1.017,0.048,1.022,0.023, and1.047respectively. What was the average mass of lead? Round your answer to the nearest thousandth.